How much material will be left if a radioactive isotope has a half life of 1.3 billion years in 3.9 billion years?
1 Answer
Jul 21, 2014
You will have 12.5 % of the parent material after 1.3 billion years.
This problem is like the one at
Method 1
In your problem, the number of half-lives is
The amount remaining after 3 half-lives is
100 % ×
Method 2